[GNC] Problem with online banking setup in Ubuntu

[WaltD]

     I am new to GnuCash. My OS is Ubuntu Unity 16.04 LTS.  I just created a
new file with new accounts. I am trying to setup online banking to my
checking account. In the online setup wizard I reach a point where I'm to
"Start AqBanking Wizard". When I click on the AqBanking button nothing
happens and the GnuCash program closes. 
     When I restart GnuCash, I get this strange message: GnuCash could not
obtain the lock for
file:///home/walter/GnuCash/Book01.gnucash. (Book01 is the new file I
created). How can I complete the online setup? 



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